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Finding the Fourth Proportional to 21,881.97, 30,179.07 and 13,910.31

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Solution

The fourth proportional to 21,881.97, 30,179.07 and 13,910.31 is: 19,184.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,881.97 : 30,179.07 = 13,910.31 : x
  2. Step 2: Convert to fraction form
    21,881.97/30,179.07 = 13,910.31/x
  3. Step 3: Cross multiply
    21,881.97x = 30,179.07 × 13,910.31
  4. Step 4: Simplify right side
    21,881.97x = 419,800,219.21
  5. Step 5: Solve for x
    x = 419,800,219.21/21,881.97
  6. Step 6: Final answer
    x = 19,184.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.